diff --git a/src/info.h b/src/info.h
index aa9bdd29d..75f721188 100644
--- a/src/info.h
+++ b/src/info.h
@@ -1155,7 +1155,7 @@ typedef enum playersprite
 	SPR2_XTRA, // stuff that isn't in-map - "would this ever need an md2 or variable length animation?"
 
 	SPR2_FIRSTFREESLOT,
-	SPR2_LASTFREESLOT = 1024, // Do not make higher than SPR2F_MASK
+	SPR2_LASTFREESLOT = 1024, // Do not make higher than SPR2F_MASK (currently 0x3FF) plus one
 	NUMPLAYERSPRITES
 } playersprite_t;
 
diff --git a/src/p_pspr.h b/src/p_pspr.h
index e8c84daaa..be0d9f39e 100644
--- a/src/p_pspr.h
+++ b/src/p_pspr.h
@@ -97,8 +97,10 @@
 /// \brief Frame flags - Animate: Start at a random place in the animation (mutually exclusive with above)
 #define FF_RANDOMANIM 0x40000000
 
-#define SPR2F_MASK 0x7FFF
-#define SPR2F_SUPER 0x8000
+/// \brief Animation flags: Bits used for the animation ID
+#define SPR2F_MASK 0x3FF
+/// \brief Animation flags: "Super" flag
+#define SPR2F_SUPER 0x400
 
 /**	\brief translucency tables