diff --git a/README.md b/README.md
index 8107527..d3a4ebc 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ The CID Checker as a service provides two REST endpoints, where you need to spec
 
 3. The back-end automates the process of fetching the new data, which requires thousands of JSON RCP calls for every loop.
 
-4. Effective and reliable Mongo DB database with indexes provides fast paginated search by Deal ID, File CID, Miner ID.
+4. Effective and reliable Mongo DB database with indexes provides fast paginated search by Deal ID, Piece CID, Miner ID.
 
 5. UI provides rich details on deals.
 For the end user it doesn't require any developer skills to quickly get information on deals. 
@@ -44,12 +44,12 @@ If you are a total beginner to this, start here!
 
 **Use remote CID checker service:**
 1. Navigate to the website: [www.filecoin.tools](https://deploy-preview-20--filecoincidchecker.netlify.app/)
-2. See the list of all file CIDs and related information:
+2. See the list of all piece CIDs and related information:
 - Deal ID
 - Miner ID
 - Sector number
 - Status
-3. Search a record by a File CID, Deal ID, or Miner ID
+3. Search a record by a Piece CID, Deal ID, or Miner ID
 4. Click on a chosen record and see other related details
 
 **If you are running an own Filecoin (Lotus) node:**
@@ -96,7 +96,7 @@ Two API endpoints available:
 #### :8080/deals
 Get deals information about all deals from the database.
 #### :8080/deals/:selector
-Get deals by selector: File CID, Miner ID and Deal ID.
+Get deals by selector: Piece CID, Miner ID and Deal ID.
 
 Both endpoints support pagination.
 
diff --git a/SRS/SRS_confirm_5Jun.md b/SRS/SRS_confirm_5Jun.md
index f2af5cb..df79473 100644
--- a/SRS/SRS_confirm_5Jun.md
+++ b/SRS/SRS_confirm_5Jun.md
@@ -31,11 +31,11 @@ Scenario: Retrieve the info related to all CIDs
 ```
 >
 ```gherkin=
-Feature: search info by the file CID 
+Feature: search info by the piece CID 
 
   # indexing the Filecoin state by the CID
-  Scenario: Query the info related to file CID
-    When User enters the file CID into the Search window
+  Scenario: Query the info related to piece CID
+    When User enters the piece CID into the Search window
     Then the APP lists the Miners storing this CID,
 	  sectors they are storing,
 	  and the state as a colored indicator
@@ -70,7 +70,7 @@ User->APP: 1.URL
 Note right of APP: Navigating to the URL
 APP-->User: List of CIDs
 
-User->APP: 2.File CID
+User->APP: 2.Piece CID
 Note right of APP: indexing the latest state by the CID
 APP-->User: List of Miners storing this file
 
diff --git a/internals/api/handlers/deals.go b/internals/api/handlers/deals.go
index aa5303b..f3ec415 100644
--- a/internals/api/handlers/deals.go
+++ b/internals/api/handlers/deals.go
@@ -31,7 +31,7 @@ type DealsResponse struct {
 }
 
 // CreateDealsHandler creates handler for /deals requests.
-// Returns deals information by deal ID (not CID, just integer id), file CID or miner id (not CID, id in string form similar to "t01000").
+// Returns deals information by deal ID (not CID, just integer id), piece CID or miner id (not CID, id in string form similar to "t01000").
 func CreateDealsHandler(dealsRepo repos.DealsRepo, sectorsRepo repos.SectorsRepo) gin.HandlerFunc {
 	return func(c *gin.Context) {
 		selector := c.Param("selector")