diff --git a/include/psa/crypto_extra.h b/include/psa/crypto_extra.h
index 0e2d57c..56fe1d3 100644
--- a/include/psa/crypto_extra.h
+++ b/include/psa/crypto_extra.h
@@ -1939,6 +1939,9 @@
  *
  * This macro must expand to a compile-time constant integer.
  *
+ * The value of this macro must be at least as large as the largest value
+ * returned by PSA_PAKE_OUTPUT_SIZE()
+ *
  * See also #PSA_PAKE_OUTPUT_SIZE(\p alg, \p primitive, \p step).
  */
 #define PSA_PAKE_OUTPUT_MAX_SIZE 65
@@ -1948,6 +1951,9 @@
  *
  * This macro must expand to a compile-time constant integer.
  *
+ * The value of this macro must be at least as large as the largest value
+ * returned by PSA_PAKE_INPUT_SIZE()
+ *
  * See also #PSA_PAKE_INPUT_SIZE(\p alg, \p primitive, \p step).
  */
 #define PSA_PAKE_INPUT_MAX_SIZE 65