Index: src/sqlite.h.in
==================================================================
--- src/sqlite.h.in
+++ src/sqlite.h.in
@@ -8573,10 +8573,11 @@
   unsigned char hidden[48];
 } sqlite3_snapshot;
 
 /*
 ** CAPI3REF: Record A Database Snapshot
+** CONSTRUCTOR: sqlite3_snapshot
 ** EXPERIMENTAL
 **
 ** ^The [sqlite3_snapshot_get(D,S,P)] interface attempts to make a
 ** new [sqlite3_snapshot] object that records the current state of
 ** schema S in database connection D.  ^On success, the
@@ -8660,10 +8661,11 @@
   sqlite3_snapshot *pSnapshot
 );
 
 /*
 ** CAPI3REF: Destroy a snapshot
+** DESTRUCTOR: sqlite3_snapshot
 ** EXPERIMENTAL
 **
 ** ^The [sqlite3_snapshot_free(P)] interface destroys [sqlite3_snapshot] P.
 ** The application must eventually free every [sqlite3_snapshot] object
 ** using this routine to avoid a memory leak.
@@ -8720,10 +8722,34 @@
 **
 ** SQLITE_OK is returned if successful, or an SQLite error code otherwise.
 */
 SQLITE_EXPERIMENTAL int sqlite3_snapshot_recover(sqlite3 *db, const char *zDb);
 
+
+/*
+** CAPI3REF: Human-readable description of a snapshot
+** EXPERIMENTAL
+**
+** The sqlite3_snapshot_describe(S,B,N) interface writes a human-readable
+** description of snapshot S into the array of characters B of length N.
+** As long as N is greater than 0, the string written into B is guaranteed
+** to be zero terminated.
+**
+** This routine is intended for testing and debugging use only. The details
+** of the text description written into B may vary from one release to the
+** next.
+**
+** The [sqlite3_snapshot_describe()] interface is only available when the
+** both the [SQLITE_ENABLE_SNAPSHOT] an [SQLITE_DEBUG] compile-time options
+** are used.
+*/
+SQLITE_EXPERIMENTAL void sqlite3_snapshot_describe(
+  sqlite3_snapshot*,   /* The snapshot to be described */
+  char *pBuf,          /* Write the description into this buffer */
+  int nBuf             /* Length of pBuf in bytes */
+);
+
 /*
 ** Undo the hack that converts floating point types to integer for
 ** builds on processors without floating point support.
 */
 #ifdef SQLITE_OMIT_FLOATING_POINT

Index: src/wal.c
==================================================================
--- src/wal.c
+++ src/wal.c
@@ -3512,10 +3512,33 @@
   if( pHdr1->aSalt[0]>pHdr2->aSalt[0] ) return +1;
   if( pHdr1->mxFrame<pHdr2->mxFrame ) return -1;
   if( pHdr1->mxFrame>pHdr2->mxFrame ) return +1;
   return 0;
 }
+
+/*
+** Write a human-readable description of a snapshot into a text buffer.
+*/
+void sqlite3_snapshot_describe(sqlite3_snapshot *pSS, char *z, int n){
+  WalIndexHdr *p = (WalIndexHdr*)pSS;
+  sqlite3_snprintf(n,z,
+     "mxFrame %u "
+     "nPage %u "
+     "szPage %u "
+     "iChange %u "
+     "aFrameCksum 0x%08x%08x "
+     "aSalt 0x%08x%08x "
+     "iVersion %u ",
+     p->mxFrame,
+     p->nPage,
+     p->szPage,
+     p->iChange,
+     p->aFrameCksum[0], p->aFrameCksum[1],
+     p->aSalt[0], p->aSalt[1],
+     p->iVersion
+  );
+}
 #endif /* SQLITE_ENABLE_SNAPSHOT */
 
 #ifdef SQLITE_ENABLE_ZIPVFS
 /*
 ** If the argument is not NULL, it points to a Wal object that holds a