diff --git a/doc/source/netscriptsingularityfunctions.rst b/doc/source/netscriptsingularityfunctions.rst
index 9d687b230..f69426158 100644
--- a/doc/source/netscriptsingularityfunctions.rst
+++ b/doc/source/netscriptsingularityfunctions.rst
@@ -481,6 +481,17 @@ getOwnedAugmentations
 
     This function returns an array containing the names (as strings) of all Augmentations you have.
 
+getOwnedSourceFiles
+-------------------
+
+..js:function:: getOwnedSourceFiles()
+
+    If you are not in BitNode-4, then you must have Level 3 of Source-File 4 in order to use this function.
+
+    Returns an array of source files
+    [{n: 1, lvl: 3}, {n: 4, lvl: 3}]
+
+
 getAugmentationsFromFaction
 ---------------------------
 
diff --git a/netscript.js b/netscript.js
index 6b2a336c0..b0c991af0 100644
--- a/netscript.js
+++ b/netscript.js
@@ -82,9 +82,9 @@ let NetscriptFunctions =
     "getCompanyFavor|stopAction|getFactionFavor|"                              +
     "checkFactionInvitations|joinFaction|workForFaction|getFactionRep|"        +
     "createProgram|commitCrime|getCrimeChance|getOwnedAugmentations|"          +
-    "getAugmentationsFromFaction|"                                             +
+    "getOwnedSourceFiles|getAugmentationsFromFaction|"                         +
     "getAugmentationCost|purchaseAugmentation|"                                +
-    "installAugmentations|"   +
+    "installAugmentations|"                                                    +
     "getStockPrice|getStockPosition|buyStock|sellStock|shortStock|sellShort|"  +
     "placeOrder|cancelOrder|"                                                  +
     //Hacknet Node API
diff --git a/src/NetscriptFunctions.js b/src/NetscriptFunctions.js
index 4e23fdba2..873bd9812 100644
--- a/src/NetscriptFunctions.js
+++ b/src/NetscriptFunctions.js
@@ -3094,6 +3094,25 @@ function NetscriptFunctions(workerScript) {
             }
             return res;
         },
+        getOwnedSourceFiles : function() {
+            let ramCost = CONSTANTS.ScriptSingularityFn3RamCost;
+            if (Player.bitNodeN !== 4) {ramCost *= 8;}
+            if (workerScript.checkingRam) {
+                return updateStaticRam("getOwnedSourceFiles", ramCost);
+            }
+            updateDynamicRam("getOwnedSourceFiles", ramCost);
+            if (Player.bitNodeN != 4) {
+                if (!(hasSingularitySF && singularitySFLvl >= 3)) {
+                    throw makeRuntimeRejectMsg(workerScript, "Cannot run getOwnedSourceFiles(). It is a Singularity Function and requires SourceFile-4 (level 3) to run.");
+                    return [];
+                }
+            }
+            let res = [];
+            for (let i = 0; i < Player.sourceFiles.length; ++i) {
+                res.push({n: Player.sourceFiles[i].n, lvl: Player.sourceFiles[i].lvl});
+            }
+            return res;
+        },
         getAugmentationsFromFaction : function(facname) {
             var ramCost = CONSTANTS.ScriptSingularityFn3RamCost;
             if (Player.bitNodeN !== 4) {ramCost *= 8;}