diff --git a/storm/Big.cpp b/storm/Big.cpp
index 4a3cc70..12b3234 100644
--- a/storm/Big.cpp
+++ b/storm/Big.cpp
@@ -56,6 +56,10 @@ void SBigFromUnsigned(BigData* num, uint32_t val) {
     FromUnsigned(num->Primary(), val);
 }
 
+void SBigInc(BigData* a, BigData* b) {
+    Add(a->Primary(), b->Primary(), 1);
+}
+
 void SBigMod(BigData* a, BigData* b, BigData* c) {
     uint32_t allocCount = 0;
     auto& scratch = a->Stack().Alloc(&allocCount);
diff --git a/storm/Big.hpp b/storm/Big.hpp
index 027368e..eb9281c 100644
--- a/storm/Big.hpp
+++ b/storm/Big.hpp
@@ -24,6 +24,8 @@ void SBigFromStr(BigData* num, const char* str);
 
 void SBigFromUnsigned(BigData* num, uint32_t val);
 
+void SBigInc(BigData* a, BigData* b);
+
 void SBigMod(BigData* a, BigData* b, BigData* c);
 
 void SBigMul(BigData* a, BigData* b, BigData* c);
diff --git a/test/Big.cpp b/test/Big.cpp
index 03b94c4..fdd0776 100644
--- a/test/Big.cpp
+++ b/test/Big.cpp
@@ -330,6 +330,37 @@ TEST_CASE("SBigFromUnsigned", "[big]") {
         SBigDel(num);
     }
 }
+TEST_CASE("SBigInc", "[big]") {
+    BigDataTest a, b;
+
+    SECTION("increments from 0") {
+        SBigFromUnsigned(b, 0);
+
+        SBigInc(a, b);
+
+        CHECK(a->Primary().Count() == 1);
+        CHECK(a->Primary()[0] == 1);
+    }
+
+    SECTION("increments from max uint") {
+        SBigFromUnsigned(b, UINT32_MAX);
+
+        SBigInc(a, b);
+
+        CHECK(a->Primary().Count() == 2);
+        CHECK(a->Primary()[0] == 0);
+        CHECK(a->Primary()[1] == 1);
+    }
+
+    SECTION("increments from a number") {
+        SBigFromUnsigned(b, 1337);
+
+        SBigInc(a, b);
+
+        CHECK(a->Primary().Count() == 1);
+        CHECK(a->Primary()[0] == 1338);
+    }
+}
 
 TEST_CASE("SBigMod", "[big]") {
     SECTION("mods 7 by 4") {