diff --git a/Recast/Include/Recast.h b/Recast/Include/Recast.h
index 5b34ea52..30e710e5 100644
--- a/Recast/Include/Recast.h
+++ b/Recast/Include/Recast.h
@@ -293,8 +293,8 @@ static const int RC_SPANS_PER_POOL = 2048;
 /// @see rcHeightfield
 struct rcSpan
 {
-	unsigned int smin : RC_SPAN_HEIGHT_BITS; ///< The lower limit of the span. [Limit: < #smax]
-	unsigned int smax : RC_SPAN_HEIGHT_BITS; ///< The upper limit of the span. [Limit: <= #RC_SPAN_MAX_HEIGHT]
+	unsigned int smin : RC_SPAN_HEIGHT_BITS; ///< The lower limit of the span. (Inclusive) [Limit: < #smax]
+	unsigned int smax : RC_SPAN_HEIGHT_BITS; ///< The upper limit of the span. (Exclusive) [Limit: <= #RC_SPAN_MAX_HEIGHT]
 	unsigned int area : 6;                   ///< The area id assigned to the span.
 	rcSpan* next;                            ///< The next span higher up in column.
 };