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-rw-r--r--src/signs_type.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/signs_type.h b/src/signs_type.h
index cbe3752cc..a539c6689 100644
--- a/src/signs_type.h
+++ b/src/signs_type.h
@@ -12,10 +12,11 @@
#ifndef SIGNS_TYPE_H
#define SIGNS_TYPE_H
+/** The type of the IDs of signs. */
typedef uint16 SignID;
struct Sign;
-static const SignID INVALID_SIGN = 0xFFFF;
+static const SignID INVALID_SIGN = 0xFFFF; ///< Sentinel for an invalid sign.
static const uint MAX_LENGTH_SIGN_NAME_CHARS = 32; ///< The maximum length of a sign name in characters including '\0'