diff --git a/termkey.h.in b/termkey.h.in
index d29893d..4c7270f 100644
--- a/termkey.h.in
+++ b/termkey.h.in
@@ -18,17 +18,17 @@ typedef enum {
   TERMKEY_SYM_UNKNOWN = -1,
   TERMKEY_SYM_NONE = 0,
 
-  // Special names in C0
+  /* Special names in C0 */
   TERMKEY_SYM_BACKSPACE,
   TERMKEY_SYM_TAB,
   TERMKEY_SYM_ENTER,
   TERMKEY_SYM_ESCAPE,
 
-  // Special names in G0
+  /* Special names in G0 */
   TERMKEY_SYM_SPACE,
   TERMKEY_SYM_DEL,
 
-  // Special keys
+  /* Special keys */
   TERMKEY_SYM_UP,
   TERMKEY_SYM_DOWN,
   TERMKEY_SYM_LEFT,
@@ -43,7 +43,7 @@ typedef enum {
   TERMKEY_SYM_HOME,
   TERMKEY_SYM_END,
 
-  // Special keys from terminfo
+  /* Special keys from terminfo */
   TERMKEY_SYM_CANCEL,
   TERMKEY_SYM_CLEAR,
   TERMKEY_SYM_CLOSE,
@@ -67,7 +67,7 @@ typedef enum {
   TERMKEY_SYM_SUSPEND,
   TERMKEY_SYM_UNDO,
 
-  // Numeric keypad special keys
+  /* Numeric keypad special keys */
   TERMKEY_SYM_KP0,
   TERMKEY_SYM_KP1,
   TERMKEY_SYM_KP2,
@@ -87,7 +87,7 @@ typedef enum {
   TERMKEY_SYM_KPPERIOD,
   TERMKEY_SYM_KPEQUALS,
 
-  // et cetera ad nauseum
+  /* et cetera ad nauseum */
   TERMKEY_N_SYMS
 } TermKeySym;
 
@@ -122,11 +122,11 @@ enum {
 typedef struct {
   TermKeyType type;
   union {
-    long       codepoint; // TERMKEY_TYPE_UNICODE
-    int        number;    // TERMKEY_TYPE_FUNCTION
-    TermKeySym sym;       // TERMKEY_TYPE_KEYSYM
-    char       mouse[4];  // TERMKEY_TYPE_MOUSE
-                          // opaque. see termkey_interpret_mouse
+    long       codepoint; /* TERMKEY_TYPE_UNICODE */
+    int        number;    /* TERMKEY_TYPE_FUNCTION */
+    TermKeySym sym;       /* TERMKEY_TYPE_KEYSYM */
+    char       mouse[4];  /* TERMKEY_TYPE_MOUSE */
+                          /* opaque. see termkey_interpret_mouse */
   } code;
 
   int modifiers;
@@ -139,19 +139,19 @@ typedef struct {
 typedef struct _TermKey TermKey;
 
 enum {
-  TERMKEY_FLAG_NOINTERPRET = 1 << 0, // Do not interpret C0//DEL codes if possible
-  TERMKEY_FLAG_CONVERTKP   = 1 << 1, // Convert KP codes to regular keypresses
-  TERMKEY_FLAG_RAW         = 1 << 2, // Input is raw bytes, not UTF-8
-  TERMKEY_FLAG_UTF8        = 1 << 3, // Input is definitely UTF-8
-  TERMKEY_FLAG_NOTERMIOS   = 1 << 4, // Do not make initial termios calls on construction
-  TERMKEY_FLAG_SPACESYMBOL = 1 << 5, // Sets TERMKEY_CANON_SPACESYMBOL
-  TERMKEY_FLAG_CTRLC       = 1 << 6, // Allow Ctrl-C to be read as normal, disabling SIGINT
-  TERMKEY_FLAG_EINTR       = 1 << 7  // Return ERROR on signal (EINTR) rather than retry
+  TERMKEY_FLAG_NOINTERPRET = 1 << 0, /* Do not interpret C0//DEL codes if possible */
+  TERMKEY_FLAG_CONVERTKP   = 1 << 1, /* Convert KP codes to regular keypresses */
+  TERMKEY_FLAG_RAW         = 1 << 2, /* Input is raw bytes, not UTF-8 */
+  TERMKEY_FLAG_UTF8        = 1 << 3, /* Input is definitely UTF-8 */
+  TERMKEY_FLAG_NOTERMIOS   = 1 << 4, /* Do not make initial termios calls on construction */
+  TERMKEY_FLAG_SPACESYMBOL = 1 << 5, /* Sets TERMKEY_CANON_SPACESYMBOL */
+  TERMKEY_FLAG_CTRLC       = 1 << 6, /* Allow Ctrl-C to be read as normal, disabling SIGINT */
+  TERMKEY_FLAG_EINTR       = 1 << 7  /* Return ERROR on signal (EINTR) rather than retry */
 };
 
 enum {
-  TERMKEY_CANON_SPACESYMBOL = 1 << 0, // Space is symbolic rather than Unicode
-  TERMKEY_CANON_DELBS       = 1 << 1, // Del is converted to Backspace
+  TERMKEY_CANON_SPACESYMBOL = 1 << 0, /* Space is symbolic rather than Unicode */
+  TERMKEY_CANON_DELBS       = 1 << 1, /* Del is converted to Backspace */
 };
 
 void termkey_check_version(int major, int minor);
@@ -192,15 +192,15 @@ TermKeySym termkey_keyname2sym(TermKey *tk, const char *keyname);
 TermKeyResult termkey_interpret_mouse(TermKey *tk, const TermKeyKey *key, TermKeyMouseEvent *event, int *button, int *line, int *col);
 
 typedef enum {
-  TERMKEY_FORMAT_LONGMOD     = 1 << 0, // Shift-... instead of S-...
-  TERMKEY_FORMAT_CARETCTRL   = 1 << 1, // ^X instead of C-X
-  TERMKEY_FORMAT_ALTISMETA   = 1 << 2, // Meta- or M- instead of Alt- or A-
-  TERMKEY_FORMAT_WRAPBRACKET = 1 << 3, // Wrap special keys in brackets like <Escape>
+  TERMKEY_FORMAT_LONGMOD     = 1 << 0, /* Shift-... instead of S-... */
+  TERMKEY_FORMAT_CARETCTRL   = 1 << 1, /* ^X instead of C-X */
+  TERMKEY_FORMAT_ALTISMETA   = 1 << 2, /* Meta- or M- instead of Alt- or A- */
+  TERMKEY_FORMAT_WRAPBRACKET = 1 << 3, /* Wrap special keys in brackets like <Escape> */
 
-  TERMKEY_FORMAT_MOUSE_POS   = 1 << 8  // Include mouse position if relevant; @ col,line
+  TERMKEY_FORMAT_MOUSE_POS   = 1 << 8  /* Include mouse position if relevant; @ col,line */
 } TermKeyFormat;
 
-// Some useful combinations
+/* Some useful combinations */
 
 #define TERMKEY_FORMAT_VIM (TERMKEY_FORMAT_ALTISMETA|TERMKEY_FORMAT_WRAPBRACKET)